Effects of potassium and sulphur on grain quality and yeeld components of Khaw Dauk Mali-105 rice
1998
Panpimon Suriyapromchai
Two experiments in large pots were conducted to examine effects of potassium (K) and sulphur (S) on the cooking and eating qualities of grain and yield components of Khaw Dauk Mali-105 rice. For each of the experiments a randomized complete block design with three replications was used. Grain and stubble of rice were analized for N, P and K. Qualities of the cooked milled rice were measured with sensory methods. Application of K to the soil that had K at the level deficient for paddy production but sufficient for stubble production of rice resulted in: 1) increased in number of panicles per pot and number of filled grains per panicle up to a certain rate of fertilizer above which increased rates of fertilizer resulted in trends of decreases in these yield components; 2) increases in weight of 1,000 grains with increased rates of fertilizer but decreases in number of unfilled grains with increased rates of fertilizer; 3) increases in the aroma with increased rates of fertilizer up to the highest fertilizer rate; 4) increases in whiteness of the rice up to a certain rate of fertilizer above which increased rates of fertilizer did not show further effect; and 5) no effect on the softness, stickiness and glassiness of the rice. Application of S fertilizer to the soil that had S at the level that was sufficient for paddy and stubble production of rice resulted in; 1) no effects on the yield components, aroma, softness, stickiness and glassiness of rice; and 2) increases in the whiteness but decreases in the whiteness at too high rates of fertilizer.
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